Quantum

Ground-State Dressing and Delayed Feedback of a Chiral Giant Atom in Ultrastrong Waveguide QED

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Briefings

A chiral giant atom coupled to a waveguide exhibits distance-independent spectral density at a specific coupling phase, while its virtual-photon cloud retains directional chirality. This behavior persists in the renormalized ground-state dressing and memory kernel, with a sudden coupling switch-off releasing directional radiation. The study uses variational polaron transformation to analyze spontaneous-emission dynamics in the polaron frame.

Key points

• At a coupling phase of pi/2, the total spectral density of a chiral giant atom coupled to a waveguide becomes independent of the distance between coupling points.
• The virtual-photon cloud remains chiral despite the distance independence of the total spectral density.

Context

This research investigates ultrastrong coupling between a chiral giant atom and a one-dimensional waveguide, revealing unique spectral and radiative properties at specific coupling phases.

Limitations

Results are based on a single variational polaron transformation; memory kernel independence holds only at the specified phase. No experimental validation or additional data sources provided.

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